Waved (undulated) steel fiber (URW)

RECOMMENDATIONS FOR USE OF FIBRE PRODUCED BY PJSC «STALKANAT-SILUR» FOR PREP-ARATION OF THE STEEL FIBRE CONCRETE MIX

Preparation of steel-fiber concrete mix is ​​carried out, as a rule, in serial forced concrete mixers. It is also allowed to use other types of mixers, providing a homogeneous concrete mix.

Selection of the optimal consistency of the steel-fiber concrete mix for a given workability due to the introduction of plasticizing additives;

uniform supply of fiber to the mixer (feeding a full dose of fiber into the mixer per batch at one time is not recommended);

reduction of the duration (within the technological regulations) of the mixing time of the mixture;

the volume of working batches in the preparation of steel-fiber concrete mixes in forced concrete mixers (in order to exclude the possibility of mixer overload) is recommended to be reduced by 25-30% compared with the volume of similar batches assigned for ordinary (heavy) concrete.

If the fiber content is less than 40 kg in 1 m3 of the mixture, the volume of working batches may not be reduced.

ADDING FIBER TO CONCRETE

Fiber is loaded in a uniform and continuous flow in 3–4 doses at intervals of 1–1.5 minutes (with a rotating drum of the mixer)

The concrete mixer on the automobile chassis is loaded with ready-mixed concrete (or the concrete mix is ​​prepared directly in the mixer) and before unloading, a metered portion of fiber is fed in a uniform stream into the rotating drum with the ready-mixed concrete in compliance with the fiber supply conditions;

the mixing time interval of the steel-fiber concrete mixture should not exceed, as a rule, 3 minutes. The establishment of working intervals of mixing time is carried out empirically during the development of the technological process.

RECOMMENDED DOSAGE

The fiber content in steel fiber concrete (flow rate per 1m3 SPS mixture) is determined by the requirements for its physical and mechanical properties, assigned from the conditions of use. Depending on the scope of steel fiber concrete, the fiber content in it can be recommended as follows, in kg / m3:

• plates of industrial floors – 20 ÷ 40;
• construction of residential buildings – 25 ÷ 50;
• structures and structures that are operated under environmental conditions – 40 ÷ 70;
• construction of tunnels, roads, etc. -50 ÷ 100;

 The most common type of fiber:

ADVANTAGES OF USING FIBRE PRODUCED BY PJSC «PA «STALKANAT-SILUR»
–       considerably higher resistance to cracks and bending;

–        excellent cohesion with concrete;

–        higher impact strength;

–        higher water permeability of concrete;

–        better behaviour at shrinkage;

–        no rejections at reinforcement;

–        special equipment is not needed;

–        no lumps are formed;

–        strengthening of corners and edges;

–        simple of usage;

–        simple finishing of surfaces;

–        extended service life of constructions.

ECONOMIC BENEFITS OF STEEL FIBRE USE

–        reduction of coating  thickness;

–        reduction of labour costs

–        reduction of construction period;

–        easy manual or machine-made placement.

QUALITATIVE PARAMETERS OF STEEL FIBRE CONCRETE

STRENGTH – maximum stress level that the material can withstand:

~ increase in tensile strength in bending – 50 ÷ 200%;

~ increase in endurance limit – 25 ÷ 30%;

~ increase in compressive strength – 50 ÷ 150%.

DEFORMABILITY – the deformative properties of steel fiber concrete, ceteris paribus, are directly proportional to the degree of volume saturation and inversely proportional to the diameter of the fibers;

~ increase in the value of the initial modulus of elasticity – 10 ÷ 30%;

~ increase in the initial coefficient of transverse deformation – 10 ÷ 20%.

CRACKING RESISTANCE – ability of the material to prevent crack initiation and spreading:

~ increase in crack resistance -30-80%.

FROST RESISTANCE – the frost resistance of steel fiber reinforced concrete increases due to the formation of a finely porous matrix structure with a high content of closed pores and depends on the parameters of the fiber reinforcement and the structure of the concrete matrix:

~ increase in frost resistance of steel fiber reinforced concrete in comparison with ordinary concrete reaches 800%.

CORROSION RESISTANCE – the introduction of fiber reinforcement into concrete significantly improves its structure and ensures high corrosion resistance of the fibers.

WIDE APPLICATION IN THE CONSTRUCTION OF A STEEL FIBER OF PJSC “ON” STALKANAT     PRODUCTION “WILL ALLOW YOU TO GET MORE QUALITATIVE AND LONG-TERM DESIGNS!